How many computers? In a simple random sample of

185

households, the sample mean number of personal computers was

2.55

. Assume the population standard deviation is

=0.64

.

Part: 0 / 4

0 of 4 Parts Complete

Part 1 of 4

(a) Construct a

90

%

confidence interval for the mean number of personal computers. Round the answer to at least two decimal places.

A

90

%

confidence interval for the mean number of personal computers is

<<

.